Golang批量改名文件教程详解

func main() {
    dir := flag.String("dir", ".", "目标目录")
    prefix := flag.String("prefix", "", "新前缀")
    suffix := flag.String("suffix", "", "新后缀")
    newExt := flag.String("ext", "", "新扩展名（含点，如 '.txt'）")
    dryRun := flag.Bool("dry-run", false, "仅预览不执行")
    flag.Parse()

    files, _ := os.ReadDir(*dir)
    for i, f := range files {
        if !f.IsDir() && !strings.HasPrefix(f.Name(), ".") {
            oldPath := filepath.Join(*dir, f.Name())
            nameOnly := strings.TrimSuffix(f.Name(), filepath.Ext(f.Name()))
            ext := *newExt
            if ext == "" {
                ext = filepath.Ext(f.Name())
            }
            newName := fmt.Sprintf("%s%s%s%s", *prefix, nameOnly, *suffix, ext)
            newPath := filepath.Join(*dir, newName)

            if *dryRun {
                fmt.Printf("[DRY] %s → %s\n", f.Name(), newName)
                continue
            }

            if _, err := os.Stat(newPath); err == nil {
                fmt.Printf("⚠️  跳过：%s 已存在\n", newName)
                continue
            }

            if err := os.Rename(oldPath, newPath); err != nil {
                fmt.Printf("❌ 失败：%s → %s ：%v\n", f.Name(), newName, err)
            } else {
                fmt.Printf("✅ %s → %s\n", f.Name(), newName)
            }
        }
    }
}